ReadyNAS Pro 6 and WD Red 6TB drives questions

StephenB wrote:
Single redundancy would give you 22 TB (and use all the space on the W60EFRX drives). Dual redundancy would give you only 16 TB (using only 4 TB of space on the W60EFRX drives). To use all the capacity, dual redundancy needs the 4 largest drives to be the same size. 4x6TB+2x4TB would give you 20 TB.

I misread your initial post, and thought you were running 4 TB now. So my space numbers are high. With 2x6TB+4x3TB:

Single redundancy gives you 18 TB (4*3+6)
Dual redundancy gives you 12 TB(4*3TB)
With 6x4TB + 2x3TB you'd get 18 TB in dual redundancy mode(2*6+2*3)

I have a WD60EFRX (with a second on order), but I don't have it in my Pro-6. They should work though.

applesandsynths wrote:
I was hoping to add 6tb drives one by one whenever I am able to, though I'm guessing dual redundancy will be a bit of an issue then. What would be the best upgrade path if I'm sticking with 6tb drives and the existing 3s?

Since all your slots are already full, you'd need to destroy your existing volume to switch to dual redundancy. So you'd need to restore the data from backup. You could do that at any point, but of course the more data you have the longer it will take.

One way to handle it would be to buy the next two 6TB drives together (perhaps waiting longer), and convert when you get them. Then you'd retain the 18 TB capacity you'll get when you install the first two.

Buying the last two together also preserves capacity (that is, 4x6TB+2x3TB single gives you 24 TB, 6x6TB dual also gives you 24 TB).

As you likely already know, the NAS reports space in TiB units - so the capacity in frontview will be about 10% smaller than the values above.